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Microchip Technology 1N3157A/TR
- Part No.:
- 1N3157A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N3157A/TR.pdf
- Description:
- DIODE ZENER 8.4V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:5,039
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Product details
Overview
1N3157A/TR from Microsemi is a temperature-compensated 8.4 V Zener reference diode in DO-7 (DO-204AA) glass axial-leaded package, rated for ±5% voltage tolerance, 0.001 %/°C temperature coefficient, and 10 mA test current. It delivers stable voltage reference performance in precision instrumentation, military-grade power supplies, and high-reliability analog circuits operating from –55 °C to +150 °C.
For engineers reviewing the 1N3157A/TR datasheet, 1N3157A/TR pinout, 1N3157A/TR application, or 1N3157A/TR equivalent, key selection criteria include its ultra-low TC (0.001 %/°C), hermetic glass packaging, MIL-PRF-19500/158 qualification eligibility, RoHS-compliant e3 variant option, and tape-and-reel (TR) availability for automated assembly.
Technical Context
This device belongs to Microsemi's JEDEC-registered 1N3154–1N3157A series of zero-TC Zener reference diodes. It achieves minimal voltage drift via internal metallurgical compensation, with specified ΔVZT ≤ 17 mV over –55 °C to +150 °C and zener impedance ZZT ≤ 15 Ω at 10 mA.
Designed for operation at 10.0 mA (90 mW max dissipation), it exhibits nonsensitive ESD behavior per MIL-STD-750 Method 1020 and supports flexible axial-lead mounting. Its cathode band marking and polarity requirement (banded end positive) define unidirectional biasing in circuit design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ @ IZT | 8.00–8.80 V at 10 mA - defines nominal 8.4 V reference with ±5% initial tolerance |
| Temperature Coefficient αVZ | 0.001 %/°C - enables <±0.15 mV/°C drift across full operating range |
| Max ΔVZT | 17 mV over –55 °C to +150 °C - quantifies worst-case voltage excursion in thermal cycling |
| Zener Impedance ZZT | ≤15 Ω at 10 mA - ensures low dynamic resistance for stable regulation under load transients |
| Reverse Current IR @ 5.5 V | ≤10 μA - confirms low leakage below knee voltage, critical for low-power bias networks |
| Power Dissipation | 500 mW @ TL = 25 °C - sets absolute thermal limit; 90 mW typical at 10 mA operation |
| Operating Temperature | –55 °C to +150 °C - supports extended-range industrial, aerospace, and downhole applications |
Pinout & Package
Package: DO-7 (DO-204AA), hermetically sealed glass axial-leaded case with tin-lead or matte-tin plating, cathode band marking, weight 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; reverse-biased operation requires this terminal negative relative to cathode |
| Cathode (banded end) | Reference output node | Provides stabilized 8.4 V potential when reverse-biased; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low temperature coefficient | 0.001 %/°C enables sub-0.2 mV/°C drift in precision voltage references |
| Hermetic glass DO-7 package | Ensures long-term stability and moisture immunity in harsh environments |
| MIL-PRF-19500/158 qualification path | Supports JANTXV-level military use via prefix/suffix modification (e.g., JANTXV1N3157A-1) |
| RoHS-compliant e3 variant | Enables commercial designs requiring lead-free compliance without performance trade-off |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in layout |
Applications
| High-Accuracy Data Acquisition Systems | Military Power Supply Regulation |
|---|---|
Use Scenario: ADC reference input and sensor excitation in airborne telemetry units where ambient temperature swings exceed 200 °C. IC Role / Device Role / Timing Role: Precision voltage reference source for 16-bit SAR ADCs and bridge sensor interfaces. Use Value: 0.001 %/°C TC and ≤17 mV total ΔVZT ensure reference error remains <0.02% FS across full mission temperature profile. | Use Scenario: Voltage reference in radiation-tolerant DC-DC converter feedback loops for satellite power management units. IC Role / Device Role / Timing Role: Stable 8.4 V setpoint for error amplifiers in isolated flyback regulators. Use Value: Hermetic DO-7 package and MIL-qualified variants support operation in vacuum, radiation, and thermal shock environments. |
| Industrial Process Control Transmitters | Downhole Oil & Gas Instrumentation |
Use Scenario: 4–20 mA loop-powered transmitter calibration reference in refinery control cabinets with ambient temperatures up to +85 °C. IC Role / Device Role / Timing Role: Primary voltage standard for DAC output scaling and current loop accuracy verification. Use Value: Tight 8.00–8.80 V tolerance and low ZZT (<15 Ω) minimize gain error and load-induced drift in 2-wire loop designs. | Use Scenario: Reference element in high-temperature pressure sensors deployed at 175 °C wellbore depths. IC Role / Device Role / Timing Role: Biasing and reference node for silicon piezoresistive sensing elements. Use Value: Guaranteed operation to +150 °C and ΔVZT ≤17 mV enable usable reference stability where silicon ICs fail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3157-1/TR | Same electrical specs but qualified to JANTXV level per MIL-PRF-19500/158; includes -1 suffix and JAN/JANTXV prefix option | Required for defense/aerospace programs mandating MIL-spec traceability and screening | Select 1N3157-1/TR when full military qualification (not just compatibility) is contractually required |
| LM399H | Monolithic buried-Zener IC with 2 ppm/°C TC, 6.95 V output, and internal heater; requires 10 mA supply current and thermal stabilization time | Suitable for lab-grade metrology and calibration equipment where ultra-low TC outweighs size/power constraints | Choose LM399H only when sub-ppm/°C stability is mandatory and board space/thermal design permits |
Compared with 1N3157A/TR, 1N3157-1/TR adds full MIL-PRF-19500/158 qualification while retaining identical electrical behavior, whereas LM399H trades simplicity and ruggedness for higher precision at the cost of complexity, power, and warm-up latency.
Availability
1N3157A/TR is available at Aetrix Electronics and suitable for high-reliability instrumentation, aerospace power systems, and industrial process control applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N3157A/TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N3157A/TR belongs to Microsemi's legacy 1N315x series of temperature-compensated Zener reference diodes, engineered specifically for applications demanding minimal voltage drift across extreme thermal environments.
FAQ
What is the nominal Zener voltage and tolerance of the 1N3157A/TR?
The 1N3157A/TR has a nominal Zener voltage of 8.4 V with a guaranteed range of 8.00–8.80 V at 10 mA test current, corresponding to ±5% initial tolerance. This specification is defined in the Electrical Characteristics table of the official Microsemi datasheet and applies directly to the 1N3157A/TR variant with TR tape-and-reel packaging.
What does the "A" suffix indicate in 1N3157A/TR?
The "A" suffix in 1N3157A/TR denotes the lowest temperature coefficient grade in the 1N3154–1N3157 family: 0.001 %/°C. This distinguishes it from 1N3157 (0.002 %/°C), 1N3156A (0.002 %/°C), and other variants. The "A" grade is confirmed in the Electrical Characteristics table and applies identically to the TR-packaged 1N3157A/TR.
Is the 1N3157A/TR RoHS compliant?
The base 1N3157A/TR is not inherently RoHS compliant; however, Microsemi offers an RoHS-compliant version by adding the "e3" suffix, resulting in part number 1N3157Ae3/TR. Per the datasheet, the e3 suffix indicates annealed matte-tin plating and compliance with EU RoHS Directive 2011/65/EU, but this variant is not applicable to military versions.
What is the maximum operating temperature range for the 1N3157A/TR?
The 1N3157A/TR is rated for continuous operation from –55 °C to +150 °C, as specified in the Maximum Ratings section of the Microsemi datasheet. This extended range is enabled by its hermetic DO-7 glass package and internal metallurgical temperature compensation, making it suitable for downhole, avionics, and high-temperature industrial environments.
How is polarity identified on the 1N3157A/TR package?
The 1N3157A/TR uses a cathode band marking on the glass body to indicate polarity: the banded end is the cathode and must be held positive relative to the unbanded (anode) end during reverse-bias operation. This marking is consistent across all DO-7 packaged devices in the 1N3154–1N3157A series and is explicitly stated in the Mechanical and Packaging section of the datasheet.
1N3157A/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5.5 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-7
1N3157A/TR FAQ
1.How can I place an order for 1N3157A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3157A/TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1N3157A/TR reliable?
The price and inventory of 1N3157A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3157A/TR is usually 5 days.
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1N3157A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3157A/TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1N3157A/TR?
For technical support, including 1N3157A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3157A/TR requirements.
6.How does Aetrix verify that 1N3157A/TR is sourced from the original manufacturer or authorized distributors?
All 1N3157A/TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N3157A/TR meets industry standards.
7.What is the process for return or replacement of 1N3157A/TR?
All 1N3157A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3157A/TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1N3157A/TR part is unused and in its original packaging.
Return procedure for 1N3157A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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